signalMacros.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | www.openfoam.com
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-------------------------------------------------------------------------------
    Copyright (C) 2019 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Description
    File-local code for setting/resetting signal handlers.
 
SourceFiles
    signalMacros.C
 
\*---------------------------------------------------------------------------*/
 
#include "error.H"
#include <csignal>
 
// * * * * * * * * * * * * * * * Local Functions * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Saved old signal trapping setting (file-local variable)
static struct sigaction oldAction_;
 
 
static void resetHandler(const char *what, int sigNum)
{
    if (sigaction(sigNum, &oldAction_, nullptr) < 0)
    {
        FatalError
            << "Cannot unset " << what << " signal (" << sigNum
            << ") trapping" << endl
            << abort(FatalError);
    }
}
 
 
static void setHandler(const char *what, int sigNum, void (*handler)(int))
{
    struct sigaction newAction;
    newAction.sa_handler = handler;
    newAction.sa_flags = SA_NODEFER;
    sigemptyset(&newAction.sa_mask);
    if (sigaction(sigNum, &newAction, &oldAction_) < 0)
    {
        FatalError
            << "Could not set " << what << " signal (" << sigNum
            << ") trapping" << endl
            << abort(FatalError);
    }
}
 
} // End namespace Foam
 
 
// ************************************************************************* //